Improvement in sewing-machines



I 2 heetsnhee i". JHN SPElRS.

I provment in Sewing-Machine;

N0 127,11@ Patented May 21,1872.

` 2 Sheets--Sheet 2. 'Jon-1N SPams.

Ilf'rlprovemen in Sewing-Machines.

Nl 12H14. Patented May 21\,187 2.-

@Mga/i UNITED STATES PATENT OFFICE.

JOHN SPEIRS, OF NEW YORK, N. Y., ASSIGNOR TO THE MANHATTAN SEVV- ING-MACHINE COMPANY, OF SAME PLACE.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 127,114, dated May 21, 1872; antedated May G, 18172.

To all whom it may concern:

Be it known that I, J onN SrErRs, of the city, county, and State of New York, have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing forming part of this specification.

This invention consists in a novel mode of connecting the needle-arm with the needlebar, whereby the easy and straight ope-ration of the latter by the former, withoutthe intervention of a link, is provided for.

In the accompanying drawing, Figure 1 is a side view of a sewing-machine in part made according to my invention. Fig. 2 is an inverted plan of the same. Fig. 3 is a front-end view of the upper portion of the machine. Fig. 4 is a vertical section of the device by which the needle-arm is connected with the needle-bar, and Fig. 5 is a horizontal section thereof.

A represents the bed-plate of the machine,

B its frame, and G the operating or driving shaft. The said driving-shaft C is supported in suitable bearings a a projecting from the under side of the bed-plate A, and is driven in the ordinary manner. Formed on this shaft isa double crank, D, which is connected by a connecting-rod, E, with one end of a bellcrank, F, supported in suitable bearings b b on the under side of the bed-plate A. The other end of the said bell-crank is connected by a link or connecting-rod, G, with the lower end of the needle-arm H, which is pivoted by a pivot, c, to the frame B. The connectingrod E, bell-crank F, link G, and the needlearm H, are all arranged to operate in the same vertical line or plane, whereby all lateral play or strain is obviated. I is a miter-wheel, which is arranged on the driving-shaft O and gears with a miter-wheel, J, on the end of a shaft, K, that is supported in bearings on the under side of the bed-plate A, at right angles to the i shaft C. Near the far end of this shaft K there is a double crank, L, which is connected, by a connecting-rod, M, with the shuttle driver or carrier N, which works in a guide in the bed-plate. The needle-arm H is connected with the needle-bar O, which slides vertically in suitable bearings in the frame B by a clip, P. The body or stock of this clip has a vertical hole in it for the reception ofthe needlebar O, and the jaws have each a horizontal hole for the reception of a pin, Q, the ends of which are round, but the middle portion d hattened, as shown in Figs. 4 and 5. In the adjacent end of the needle-arm there is a deep notch, e, of a width to embrace the flattened portion of the pin Q.

In the operation of the machine, as the needle-arm moves the needle-bar up and down the pin Q turns within the clip to adjust itself to the inclination of the notch e, and the said notch slides longitudinally overthe iiattened portion of the pin, as by the radial motion of the needle-arm its end is alternately moved nearer to and further from the needle-bar, and by this means an easy and almost frictionless connection is obtained.

R is the presser-bar, and Sis the presserfoot, which is secured to the lower end thereof. The said bar slides vertically in suitable bearings in the forward part f of the frame B, and has on its upper portion a horizontal arm, T, that is secured to the said bar by a set-screw, g, and has formed, in the end next the needlebar, a hole for the reception of a guide-pin, h, on which it slides, and which by its lateral position eifectually serves to steady the presserbar and hold itin place.

The presser-foot may be turned to one side by simply loosening the set-screw g to free the presser-bar and then turning it by hand.

The presser-foot may be adjusted to different thicknesses of material by simply shifting the arm T on the presser-bar The tension is applied by a spiral spring, U, coiled round the presser-bar between its upper bearing and a collar, V, secured on it by a set-screw.

W is the lifter, which is of ordinary form, and is pivoted to the frame B, and works un6 der the arm T to lift the presser-bar.

This improvement is more or less applicable end of the needle-arm H, all arranged subto different kinds of sewing-machines. stantially as and for the purpose herein de- WhatI claim as my invention7 and desire scribed.

to secure by Letters Patent, is Y JOHN SPEIRS.

The clip P, constructed as described, se- Witnesses:

cured to the needle-bar O7 and provided With HENRY T. BROWN,

a flattened pin7 Q, for operation by the notched FRED. HAYNES. 

